Hi Rob,
to IIS mate,
You are welcome to join us at the Airfield on the 22nd. Come an hour or so before sunset and I'm sure people there would be only too happy to help you.
There is another mob that goes up to the Blue Mountains for observing, the Western Sydney Amateur Astronomy Group:
http://wsaag.org/
They do their dark sky viewing from Linden Observatory, and they will be up there on the 21st I'm sure. They too will most certainly be only too happy to help you out. They are a friendly mob I've had the pleasure of meeting,
. If you do end up going to Linden Obs on the 21st, you can then continue thrashing your new scope on the 22nd,
Alex.